Note that "kettling" does not occur anywhere in https://fas.org/irp/doddir/army/fm3-19-15.pdf and in fact 2-90 clearly states "A crowd on the move should not be hurried to avoid panic. At no time should the crowd be cornered in a position where there is the perception of no escape. This invokes the “fight-or-flight” syndrome, possibly escalating violent activity."
Fig 2-2 includes "Indicate the method, streets, and direction that the crowd should use when dispersing."
Todd Winn was right to say that problematic police need "accountability for failed TTPs and EOF abuse." (Tactics, Techniques, Procedures) (Escalation of Force)